Finding the Fourth Proportional to 22,409.64, 30,923.49 and 12,978.81

Step by Step Solution

1. Step 1: Write the proportion equation
   22,409.64 : 30,923.49 = 12,978.81 : x
2. Step 2: Convert to fraction form
   22,409.64/30,923.49 = 12,978.81/x
3. Step 3: Cross multiply
   22,409.64x = 30,923.49 × 12,978.81
4. Step 4: Simplify right side
   22,409.64x = 401,350,101.25
5. Step 5: Solve for x
   x = 401,350,101.25/22,409.64
6. Step 6: Final answer
   x = 17,909.71